Life Fitness T3, Service Manual

Page: 52 / 67

Section 4 6
Life Fitness T-Series Consumer Treadmills
ELECTRONIC OVERVIEW – MOTOR CONTROLLER PCB
Functional Description
The Motor Controller PCBs are designed to act as an interface between the Drive motor, Display Console, and the
Lift Motor. The desired belt speed and elevation is sent down to the motor controller and lift motor via the users
selected input into the console. The motor is driven by a fixed frequency variable duty cycle signal. If an error
condition is detected the main power relay is opened, the PWM pulse is terminated, and the console is informed.
The main power relay receives its bus voltage from the console through the emergency pull switch. This relay can
be energized by having the emergency pull switch is in its proper place. Opening of the relay does not remove
power to the console or the logic on the motor control board, but will interrupt power to the lift and drive motors.
Connector and Pin Functions
Connector Location Pin Functional Description
LED 1 Main loop monitor
LED 2 Communication monitor
LED 3 Home switch monitor
Service LED See illustration
above
LED 4 RPM monitor
TP 1 +8 vdc for console
TP 2 Ground return for TP1
TP 3 +5 vdc for microprocessor on motor controller
TP 4 15 vdc
TP 5 15 vdc
TP 6 Ground return for TP3 and TP5
Test Point See illustration
above
TP 7 Ground
P5,3
P5,2
P5,1
P6,1
P6,2
TP5
P7
P4
P3
TP4
TP3
TP6
TP1
TP2
P1
LED1,2,3,4
TP7